FFA.Dystruderts

Key to Subgroups

FFAA. Dystruderts that have, in one or more horizons within 100 cm of the mineral soil surface, aquic conditions for some time in normal years (or artificial drainage) and either:
1. Redoximorphic features; or
2. Enough active ferrous iron (Fe2+) to give a positive reaction to alpha,alpha-dipyridyl at a time when the soil is not being irrigated. Aquic Dystruderts
Soil Families and Soil Series in Subgroup

FFAB. Other Dystruderts that are saturated with water in one or more layers within 100 cm of the mineral soil surface in normal years for either or both:
1. 20 or more consecutive days; or
2. 30 or more cumulative days. Oxyaquic Dystruderts
Soil Families and Soil Series in Subgroup

FFAC. Other Dystruderts that have a densic, lithic, or paralithic contact within 100 cm of the mineral soil surface. Leptic Dystruderts
Soil Families and Soil Series in Subgroup

FFAD. Other Dystruderts that have a layer 25 cm or more thick that contains less than 27 percent clay in its fine-earth fraction and has its upper boundary within 100 cm of the mineral soil surface. Entic Dystruderts
Soil Families and Soil Series in Subgroup

FFAE. Other Dystruderts that have, in one or more horizons within 30 cm of the mineral soil surface, 50 percent or more colors as follows:
1. A color value, moist, of 4 or more; or
2. A color value, dry, of 6 or more; or
3. Chroma of 3 or more. Chromic Dystruderts
Soil Families and Soil Series in Subgroup

FFAF. Other Dystruderts. Typic Dystruderts
Soil Families and Soil Series in Subgroup

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